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Glossary Anagen Hair Follicles

phase where hair actively grows

Anagen hair follicles, also known as growing hair follicles or active hair follicles, are in the phase of the hair growth cycle where the hair is actively growing. This phase can last anywhere from 2 to 7 years, during which the hair shaft is continuously produced by the follicle, resulting in longer hair. This is the most prolonged phase of the hair cycle and is crucial for determining the length of the hair.

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Research

5 / 1000+ results

research Methods in hair research: how to objectively distinguish between anagen and catagen in human hair follicle organ culture

132 citations , September 2009 in “Experimental Dermatology”

This study introduced a new classification system for distinguishing between anagen VI and early catagen stages in human hair follicle organ culture, using it to confirm eflornithine's ability to induce premature catagen.

research 17α‐estradiol induces aromatase activity in intact human anagen hair follicles ex vivo

94 citations , August 2002 in “Experimental Dermatology”

This study found that 17α‐estradiol increases aromatase activity in female hair follicles, which may explain its beneficial effects in treating androgenetic alopecia.

research Peptidylarginine Deiminase Isoforms Are Differentially Expressed in the Anagen Hair Follicles and Other Human Skin Appendages

71 citations , June 2005 in “Journal of Investigative Dermatology”

This study demonstrates that PAD1 and PAD3 are involved in hair follicle differentiation, while PAD1 and PAD2 may play a role in the physiology of sweat glands and arrector pili muscles.

research Prostanoid receptors in anagen human hair follicles

39 citations , November 2007 in “Experimental dermatology”

This study found that prostaglandin receptors are widely expressed in hair follicles, suggesting a complex network of prostanoid pathways involved in hair growth control.

research Expression of the Orphan Protein Plet-1 during Trichilemmal Differentiation of Anagen Hair Follicles

30 citations , February 2010 in “The journal of investigative dermatology/Journal of investigative dermatology”

This study found that the orphan protein Plet-1 is expressed in specific keratinocytes of mouse hair follicles and may regulate keratinocyte interactions with inert tissues by affecting migration and adhesion.

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Community Join

5 / 582 results

community Anagen (@anagenxyz) claiming they've cracked scalp-only DHT blocking - thoughts?

15 upvotes 3 days ago

A company is developing a topical dutasteride that targets hair follicles without significantly affecting systemic DHT levels, with trials underway to measure its effectiveness. Users discuss the potential benefits and skepticism around the formulation compared to existing treatments.

community Precision Dutasteride (Anagen)

3 upvotes 4 days ago

A topical dutasteride by Anagen aims to target hair follicles while reducing systemic exposure, showing promising initial results in reducing serum DHT levels. The product is undergoing further trials to measure its effectiveness on hair growth and DHT levels.

community PP405 Won't Work Long Term: Hair Follicle Damage Due to Abuse of the ISR System

67 upvotes 11 months ago

PP405 may damage hair follicles if used long-term, suggesting cycling might be necessary. Combining it with finasteride could help maintain hair growth.

community if hair follicle miniaturization happens slowly and gradually over a few hair cycles then wouldn't that mean that to regain maximum or top thickness from treatment you would at least need 5-10 years?

in Research/Science 53 upvotes 10 months ago

Hair regrowth from treatments like finasteride, dutasteride, and minoxidil can take several years, with most visible results appearing within 1-2 years and potential improvements continuing up to 10 years. Consistency and patience are crucial for achieving maximum hair thickness, as hair miniaturization and regrowth are gradual processes.

community "Hair Follicle Stem Cells are quiescent 99% of the time and permanently reside in the hair follicle"

in Research/Science 1391 upvotes 1 year ago

Hair follicles are mostly dormant but can be reactivated with treatments like minoxidil, finasteride, and microneedling. A new drug, PP405, shows promise for hair regrowth but may not be available until 2027-2028.

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Learn

9 / 25 results

learn Caffeine

Does caffeine stimulate hair growth or only slow hair loss? Caffeine stimulates hair follicles in laboratory cultures, and one open-label trial in 210 men found a 0.2% caffeine topical non-inferior to minoxidil 5% on an anagen-ratio endpoint; there is no placebo-controlled evidence that it regrows hair, and none at all in alopecia areata or telogen effluvium.

learn Latanoprost

glaucoma medication with hair follicle stimulant effects

How does latanoprost work to make eyelashes and possibly scalp hair grow? Studies report that latanoprost, a prostaglandin analog, lengthens the anagen (growth) phase of hair follicles, which is the mechanism given for the eyelash thickening seen in glaucoma patients; on the scalp the evidence is one 16-man pilot study and animal work, so the effect there is unproven.

learn Exosomes

Microscopic delivery system that sends growth-promoting signals to hair follicles

learn Osteopontin

signaling protein that, when suppressed, may grow hair by reducing inflammation and stem cell loss

learn Valproic acid

an anticonvulsant repurposed for hair loss via histone inhibition

learn Dexpanthenol

precursor of vitamin B5 with hair stimulating effects

learn Folic acid

How does folic acid support hair follicle health and growth at a cellular level? Folate is required for the DNA synthesis that fast-dividing hair matrix cells depend on, and severe deficiency causes anemia—but no published trial has given folic acid to people with hair loss and measured the result, so a growth effect is a mechanism, not a finding.

learn Procyanidin

What is Procyanidin, and how does it encourage hair growth at the follicle level? Procyanidin stimulates hair growth by promoting cell proliferation in hair follicles.

learn Adenosine

Adenosine: How natural is this ingredient and how does it act on the scalp? Adenosine is a naturally occurring compound that promotes hair growth by extending the anagen phase.

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Clinics

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Experts

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Unscored
SMP Specialist
Hairo Fallas
Newark, NJ, United States

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Hairo Fallas